qrm2/cogs/gridcog.py

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"""
Grid cog for qrm
---
Copyright (C) 2019 Abigail Gold, 0x5c
This file is part of discord-qrmbot and is released under the terms of the GNU
General Public License, version 2.
"""
import discord
import discord.ext.commands as commands
import math
class GridCog(commands.Cog):
def __init__(self, bot):
self.bot = bot
self.gs = bot.get_cog("GlobalSettings")
@commands.command(name="grid")
async def _grid_sq_lookup(self, ctx, lat : str, lon : str):
'''Calculates the grid square for latitude and longitude coordinates.
Usage: `?grid <lat> <lon>`
`lat` and `lon` are decimal coordinates, with negative being latitude South and longitude West.'''
with ctx.typing():
grid = "**"
try:
latf = float(lat) + 90
lonf = float(lon) + 180
if 0 <= latf <= 180 and 0 <= lonf <= 360:
grid += chr(ord('A') + int(lonf / 20))
grid += chr(ord('A') + int(latf / 10))
grid += chr(ord('0') + int((lonf % 20)/2))
grid += chr(ord('0') + int((latf % 10)/1))
grid += chr(ord('a') + int((lonf - (int(lonf/2)*2)) / (5/60)))
grid += chr(ord('a') + int((latf - (int(latf/1)*1)) / (2.5/60)))
grid += "**"
embed = discord.Embed(title=f'Maidenhead Grid Locator for {float(lat):.6f}, {float(lon):.6f}',
description=grid, colour=self.gs.colours.good)
else:
raise ValueError('Out of range.')
except Exception as e:
msg = f'Error generating grid square for {lat}, {lon}.'
embed = discord.Embed(title=msg, description=str(e), colour=self.gs.colours.bad)
await ctx.send(embed=embed)
@commands.command(name="ungrid", aliases=['loc'])
async def _location_lookup(self, ctx, grid : str, grid2 : str = None):
'''Calculates the latitude and longitude for the center of a grid square.
If two grid squares are given, the distance and azimuth between them is calculated.'''
with ctx.typing():
if grid2 is None or grid2 == '':
try:
grid = grid.upper()
loc = self.getCoords(grid)
if len(grid) >= 6:
embed = discord.Embed(title=f'Latitude and Longitude for {grid}',
description=f'**{loc[0]:.5f}, {loc[1]:.5f}**', colour=self.gs.colours.good,
url=f'https://www.openstreetmap.org/#map=13/{loc[0]:.5f}/{loc[1]:.5f}')
else:
embed = discord.Embed(title=f'Latitude and Longitude for {grid}',
description=f'**{loc[0]:.1f}, {loc[1]:.1f}**', colour=self.gs.colours.good,
url=f'https://www.openstreetmap.org/#map=10/{loc[0]:.1f}/{loc[1]:.1f}')
except Exception as e:
msg = f'Error generating latitude and longitude for grid {grid}.'
embed = discord.Embed(title=msg, description=str(e), colour=self.gs.colours.bad)
else:
R = 6371
try:
grid = grid.upper()
grid2 = grid2.upper()
loc = self.getCoords(grid)
loc2 = self.getCoords(grid2)
# Haversine formula
dLat = math.radians(loc2[0] - loc[0])
dLon = math.radians(loc2[1] - loc[1])
a = math.sin(dLat/2) ** 2 +\
math.cos(math.radians(loc[0])) * math.cos(math.radians(loc2[0])) *\
math.sin(dLon/2) ** 2
c = 2 * math.atan2(math.sqrt(a), math.sqrt(1-a))
d = R * c
d_mi = 0.6213712 * d
# Bearing
y = math.sin(math.radians(loc2[1]-loc[1])) * math.cos(math.radians(loc2[0]))
x = math.cos(math.radians(loc[0])) * math.sin(math.radians(loc2[0])) -\
math.sin(math.radians(loc[0])) * math.cos(math.radians(loc2[0])) *\
math.cos(math.radians(loc2[1] - loc[1]))
bearing = ( math.degrees(math.atan2(y, x)) + 360 ) % 360
des = f'**Distance:** {d:.1f} km ({d_mi:.1f} mi)\n**Bearing:** {bearing:.1f}°'
embed = discord.Embed(title=f'Great Circle Distance and Bearing from {grid} to {grid2}',
description=des, colour=self.gs.colours.good)
except Exception as e:
msg = f'Error generating great circle distance and bearing from {grid} and {grid2}.'
embed = discord.Embed(title=msg, description=str(e), colour=self.gs.colours.bad)
await ctx.send(embed=embed)
def getCoords(self, grid: str):
if len(grid) < 3:
raise ValueError('The grid locator must be at least 4 characters long.')
if not grid[0:2].isalpha() or not grid[2:4].isdigit():
if len(grid) <= 4:
raise ValueError('The grid locator must be of the form AA##.')
elif len(grid) >= 6 and not grid[5:7].isalpha():
raise ValueError('The grid locator must be of the form AA##AA.')
lon = ((ord(grid[0]) - ord('A')) * 20) - 180;
lat = ((ord(grid[1]) - ord('A')) * 10) - 90;
lon += ((ord(grid[2]) - ord('0')) * 2);
lat += ((ord(grid[3]) - ord('0')) * 1);
if len(grid) >= 6:
# have subsquares
lon += ((ord(grid[4])) - ord('A')) * (5/60);
lat += ((ord(grid[5])) - ord('A')) * (2.5/60);
# move to center of subsquare
lon += (2.5/60);
lat += (1.25/60);
return (lat, lon)
else:
# move to center of square
lon += 1;
lat += 0.5;
return (lat, lon)
def setup(bot):
bot.add_cog(GridCog(bot))